linux-kernel - Re: [PATCH v3 1/n] perf/core: addressing 4x slowdown during per-process profiling of STREAM benchmark on Intel Xeon Phi

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Message-ID: <801ee488-8819-e3a7-c0a1-e91ed03b9a7b@linux.intel.com>
Date:   Fri, 30 Jun 2017 13:23:49 +0300
From:   Alexey Budankov <alexey.budankov@...ux.intel.com>
To:     Andi Kleen <ak@...ux.intel.com>
Cc:     Mark Rutland <mark.rutland@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Kan Liang <kan.liang@...el.com>,
        Dmitri Prokhorov <Dmitry.Prohorov@...el.com>,
        Valery Cherepennikov <valery.cherepennikov@...el.com>,
        David Carrillo-Cisneros <davidcc@...gle.com>,
        Stephane Eranian <eranian@...gle.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/n] perf/core: addressing 4x slowdown during
 per-process profiling of STREAM benchmark on Intel Xeon Phi

On 19.06.2017 18:34, Alexey Budankov wrote:
> On 19.06.2017 18:24, Andi Kleen wrote:
>>> One more:
>>
>> It may help if you run with KASAN enabled. That often
>> finds problems earlier.
>>
>> Also could use ftrace and use ftrace_dump_on_oops to
>> see the sequence (but that has a lot of overhead
>> and sometimes hides problems)
> 
> Ok. Will try. Thanks.

Tested patch v5 with KASAN enabled. No memory corruptions were revealed so far. 

> 
>>
>> -Andi
>>
>>
> 
>